Difficulties centering the object on the middle of the screen
I have solved your problem by Centering the thing I want to look at in every angle. Go to top view [numbpad 7], drag things I want to look at to the centre of my view by holding [shift] and [mouse 3]. Do the same with view from the front and from the right/left. When that's done you should be able to interact with your thing perfetly. 

Another way to zoom in slowly is by holding [ctrl] nad dragging with [mouse3].

Yet another way to wiew you object is by using [shift]+[f] shortcut. This shortcut lets you use your WASD keys and mouse as if you were playing a videogame. With [Q] and [E] you can move up and down.